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Positive electrode active material, positive electrode plate and sodium ion battery

A technology of positive active materials and positive pole pieces, applied in active material electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor rate performance and cycle performance, obstacles to the commercialization of sodium-ion batteries, and low capacity, and achieve Effects of high rate performance and cycle performance, high ion conductivity and electronic conductivity, and high structural stability

Inactive Publication Date: 2020-07-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently widely studied cathode active materials for sodium-ion batteries have low capacity, poor rate performance and cycle performance, which hinder the commercialization of sodium-ion batteries.

Method used

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  • Positive electrode active material, positive electrode plate and sodium ion battery
  • Positive electrode active material, positive electrode plate and sodium ion battery
  • Positive electrode active material, positive electrode plate and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] Next, a method for preparing the positive electrode active material in this application will be explained. According to this preparation method, the above-mentioned positive electrode active material can be prepared. The preparation method includes the following steps:

[0052] S10. Add copper salt, manganese salt and optionally salt containing M element to the solvent according to the stoichiometric ratio to prepare a mixed solution.

[0053] S20, adding the precipitating agent and the complexing agent to the mixed solution to prepare a reaction solution, and adjusting the pH value of the reaction solution within a predetermined range.

[0054] S30. Allow the reaction solution to undergo a co-precipitation reaction at a predetermined temperature and stirring rate, separate and collect the resulting co-precipitation product, wash the precipitated product several times with an appropriate amount of solvent, and dry it at a predetermined temperature to obtain a transition metal...

Embodiment 1

[0104] Preparation of positive electrode active material

[0105] S10. Dissolve copper sulfate pentahydrate and manganese sulfate monohydrate in deionized water under the protection of an inert atmosphere according to the stoichiometric ratio to prepare a mixed solution, wherein the total concentration of metal ions is 1.2 mol / L.

[0106] S21: Disperse the precipitant sodium carbonate in deionized water to prepare a precipitant solution, wherein the concentration of sodium carbonate is 4 mol / L. Ammonia water with a concentration of 2mol / L was used as the complexing agent solution.

[0107] S22: Add the precipitant solution and the complexing agent solution to the mixed solution to obtain a reaction solution, and control the pH of the reaction solution to 11.0.

[0108] S30. Let the reaction solution react for 20 hours at 50°C and 800 rpm stirring speed, separate and collect the obtained co-precipitation product, wash the precipitated product several times with an appropriate amount o...

Embodiment 2～19 and comparative example 1～3

[0120] Similar to Example 1, the difference is that the reaction parameters in the preparation step of the positive electrode active material are adjusted. The specific parameters are shown in Table 1 below.

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Abstract

The invention discloses a positive electrode active material, a positive electrode plate and a sodium ion battery. The molecular formula of the positive electrode active material is Na <2+x>CuhMnkMlO<7-y>, wherein in the molecular formula, M is a transition metal site doped element, M is one or more of Li, B, Mg, Al, K, Ca, Ti, V, Cr, Fe, Co, Ni, Zn, Ga, Sr, Y, Nb, Mo, Sn, Ba and W, x is greater than or equal to 0 and less than or equal to 0.5, h is greater than or equal to 0.1 and less than or equal to 2, 1<=k<=3, 0<=l<=0.5, 0<=y<=1, 2<=h+k+l<=3.5, and 0.57<=(2+x) / (h+k+l)<=0.9. The positive electrode active material provided by the invention can give consideration to relatively high initial capacity, rate capability and cycle performance at the same time.

Description

Technical field [0001] This application belongs to the technical field of energy storage devices, and in particular relates to a positive electrode active material, a positive electrode pole piece and a sodium ion battery. Background technique [0002] At present, lithium-ion batteries occupy the core position of power batteries. At the same time, lithium-ion batteries are also facing great challenges, such as the increasing shortage of lithium resources, the rising price of upstream materials, the lagging development of recycling technology, and the recycling rate of old batteries. Inferior issues. Sodium ion batteries can use the deintercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge, and the reserves of sodium resources are much richer than lithium, more widely distributed, and cost far lower than lithium, so sodium ion batteries have become very potential. A new generation of electrochemical system to replace lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/48H01M4/131H01M10/054
CPCH01M4/505H01M4/525H01M4/48H01M4/131H01M10/054Y02E60/10H01M4/485C01G45/12C01G45/1278C01P2006/12C01P2004/61C01P2004/62C01P2002/72C01P2002/74C01P2006/11C01G45/006C01P2004/52H01M4/0471H01M2004/021H01M2004/028
Inventor 刘倩郭永胜梁成都林文光
Owner CONTEMPORARY AMPEREX TECH CO
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